休暇は全くあっという間に終わってしまった。

I'll be only too pleased to help you.

休暇(きゅうか)は全(まった)くあっという間(ま)に終(お)わってしまった。

Kyūka wa mattaku attoiumani owatteshimatta.

休暇 (きゅうか)

holiday; day off; furlough; absence (from work)

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

全く (まったく)

really; truly; entirely; completely; wholly; perfectly; indeed; good grief (expression of exasperation)

あっという間に (あっというまに、あっとゆうまに)

just like that; in the twinkling of an eye; in the blink of an eye; in the time it takes to say "ah!"

終わる (おわる)

to finish; to end; to close

Readings: キュウ、やす.む、やす.まる、やす.める

Meanings: rest, day off, retire, sleep

Readings: カ、ひま、いとま

Meanings: spare time, rest, leisure, time, leave of absence

Readings: ゼン、まった.く、すべ.て

Meanings: whole, entire, all, complete, fulfill

Readings: カン、ケン、あいだ、ま、あい

Meanings: interval, space

Readings: シュウ、お.わる、 -お.わる、おわ.る、お.える、つい、つい.に

Meanings: end, finish